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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz , Oliver Hartkopp , Marc Kleine-Budde , Alexander Aring , Stefan Schmidt , Miquel Raynal , David Ahern , Willem de Bruijn , linux-bluetooth@vger.kernel.org, linux-can@vger.kernel.org, linux-wpan@vger.kernel.org Cc: kernel-team@cloudflare.com, kuniyu@amazon.com, alibuda@linux.alibaba.com, Ignat Korchagin , Vincent Mailhol Subject: [PATCH net-next v3 4/9] net: af_can: do not leave a dangling sk pointer in can_create() Date: Mon, 14 Oct 2024 16:38:03 +0100 Message-Id: <20241014153808.51894-5-ignat@cloudflare.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20241014153808.51894-1-ignat@cloudflare.com> References: <20241014153808.51894-1-ignat@cloudflare.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On error can_create() frees the allocated sk object, but sock_init_data() has already attached it to the provided sock object. This will leave a dangling sk pointer in the sock object and may cause use-after-free later. Signed-off-by: Ignat Korchagin Reviewed-by: Vincent Mailhol Reviewed-by: Kuniyuki Iwashima Reviewed-by: Marc Kleine-Budde --- net/can/af_can.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/can/af_can.c b/net/can/af_can.c index 707576eeeb58..01f3fbb3b67d 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -171,6 +171,7 @@ static int can_create(struct net *net, struct socket *s= ock, int protocol, /* release sk on errors */ sock_orphan(sk); sock_put(sk); + sock->sk =3D NULL; } =20 errout: --=20 2.39.5